The light has limited value unless it has an ID from a signature glass lamp maker such as Tiffany, Pierpoint, Handel, etc.
Without significant antique value - it is simply a billiard table light with a very old fashioned motif. You would then have a very limited buying market for such a light / and an internet sale with the shipping logistics probably would not yield much actual money in your pocket - I would recommend consignment to a local antique/ consignment dealer where a sale would not result on your shipping headache - also recommend something like Craig’s list or facebook marketplace for a local pick up sale